website/docs: add more docs for non-primary subcommands

website/docs/source/layouts/layout.erb

@@ -119,6 +119,7 @@
 									<li<%= sidebar_current("cli-status") %>><a href="/v2/cli/status.html">status</a></li>
 									<li<%= sidebar_current("cli-suspend") %>><a href="/v2/cli/suspend.html">suspend</a></li>
 									<li<%= sidebar_current("cli-up") %>><a href="/v2/cli/up.html">up</a></li>
+									<li<%= sidebar_current("cli-nonprimary") %>><a href="/v2/cli/non-primary.html">More Commands</a></li>
 									<li<%= sidebar_current("cli-machinereadable") %>><a href="/v2/cli/machine-readable.html">Machine Readable Output</a></li>
 								</ul>
 								<% end %>

website/docs/source/v2/cli/non-primary.html.md

@@ -0,0 +1,19 @@
+---
+page_title: "More Vagrant Commands - Command-Line Interface"
+sidebar_current: "cli-nonprimary"
+---
+
+# More Commands
+
+In addition to the commands listed in the sidebar and shown in `vagrant -h`,
+Vagrant comes with some more commands that are hidden from basic help output.
+These commands are hidden because they're not useful to beginners or they're
+not commonly used. We call these commands "non-primary subcommands".
+
+You can view all subcommands, including the non-primary subcommands,
+by running `vagrant list-commands`, which itself is a non-primary subcommand!
+
+Note that while you have to run a special command to list the non-primary
+subcommands, you don't have to do anything special to actually _run_ the
+non-primary subcommands. They're executed just like any other subcommand:
+`vagrant COMMAND`.